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Two years after defying death, police found the toddler and her two older siblings, Liana, 8, and Mark, Jr., 5, dead in the living room of their Pennsylvania home. Nearby were their parents, Megan and Mark Short, also dead, authorities said.

Officers with the Sinking Spring Borough and Spring Township police departments found a handgun beside one of the deceased adults, though they didn't specify who, and a handwritten "murder/suicide note" somewhere in the home, according to a statement from the Berks County District Attorney Office.

Authorities have not released a motive, but said the investigation thus far revealed there had been "domestic issues" between Megan Short, 33, and her husband, Mark, 40.

Online, Megan was not shy about those issues, a neighbor told the Reading Eagle.

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On July 23, during an exchange on Facebook, Megan Short told Angie Burke, who lives down the street, that she planned to leave her husband.

The two were commenting back and forth on a link Burke had posted to an opinion article published in The Washington Post titled "He didn't hit me. It was still Abuse," Burke told the Eagle.

In it, author Leigh Stein previewed her forthcoming memoir, where she describes the humiliation, manipulation and psychological abuse she suffered while dating her ex-boyfriend. Burke provided the newspaper with screenshots of their exchange, recounted here.

"It really does a number on your mental health for sure," Short commented.

Throughout the conversation, Megan Short said she had found a rental property and was waiting to be approved. She hoped to move to Yardley, she wrote, about an hour and a half from the family's Sinking Spring home.

Then last week, Burke saw another Facebook post from Megan, the Eagle reported, soliciting friends to help her move. She would need their assistance, Burke said, on Saturday, August 6.

Megan Short apparently told a neighbour in a social media exchange that she was leaving her husband.

Megan Short apparently told a neighbour in a social media exchange that she was leaving her husband.

When that day arrived, Burke told the newspaper she was on her way home from the bakery, where she'd picked up a birthday cake for her husband, when she saw not moving trucks, but police.

"I just got sick," Burke told the Eagle.

Police discovered the bodies when a family member called, concerned that Megan had not shown up for a scheduled lunch date, officials said.

Neighbours often saw the family on walks, towing their three blonde-haired children in a wagon. Photos on both Megan and Mark Short's Facebook pages show the five of them together on vacation at Disney World and in professionally taken portraits.

But in stories in local media, the feature in the New York Times and posts on various support blogs, it was clear the Short family had endured great struggle. The Times story documented their frustrations and anxiety trying to obtain the critical medication keeping Willow alive. In a blog post for Philly at Heart, headlined "Learning to Heal: My Experience with PTSD," Megan chronicled her battle with post traumatic stress disorder, brought on by her experiences with Willow's tenuous health.

"There are very few moments when you can clearly see your life as separated into the before and after. Having a child born with a severe congenital heart defect has been the most significant shift of my life. Like many moms, I have always put my family's needs ahead of my own and forgotten to make time to take care of myself. Having a child with a life-threatening illness intensified that. I was so focused on learning everything I could to keep my child alive and to minimize the impact on my other children that I didn't see the full impact that it had on me."

Also an advocate for organ donation, Megan spoke often about her gratitude toward the family who made Willow's survival possible.

"Someone else's child died so that my child could live," Megan told the Eagle in a profile about Willow's recovery after her transplant. "I know they're in so much pain. I am so thankful."